The re-pointing work began on 21 June, and is set to be complete by early November.
A States of Guernsey spokeswoman said the work was on track to be finished on schedule.
‘The works are primarily re-pointing the wall (renewing the mortar joints), however, where necessary, further remedial works will be undertaken,’ she said.
‘As with all works along the coastline, they represent certain challenges which must be considered, namely, works have to be scheduled during favourable seasons with regard to avoiding adverse weather conditions.
‘They must also be planned around the tides, with landward working required when the tide is in.’
The spokeswoman said it was important to undertake proactive maintenance works to sea defences to preserve the life and function of sea walls and reduce the risk of significant damage or failure.
‘This in turn ensures they continue to provide protection to other infrastructure, such as roads, utilities and properties.
‘This is why the coastal infrastructure team has an annual programme of works to strengthen Guernsey’s sea defences against the relentless pressures imposed by the sea.’
The latest phase of work forms part of an ongoing programme of capital works that has been running since 2014 to address historic underinvestment in the coastal defences.
‘Following this process it will be important that the coastal defences are regularly assessed and maintained,’ she said.
This is one of a number of projects this year to maintain and strengthen coastal defences.
The total cost of this year’s scheduled works across the island come in at some £850,000.